Chain and positional isomerism are types of structural isomerism in organic chemistry, where compounds have the same molecular formula but different structures. In chain isomerism, the carbon backbone differs in branching; for example,...

For this one we need to understand the stereospecificity of hydrogenation over platinum metal, stereochemical relationships, and the relative stability of cyclohexane chair conformations.

Defining stereochemistry and enantiomeric relationships.